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    <title>9.22-CSS课程</title>
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    <div>
      <h2>houdunren</h2>
      <h3>E19</h3>
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    <div class="user">
      <h2>小明</h2>
      <section>
        <h2>张三</h2>
        <span> yahoo </span>
      </section>
      <section>
        <h1>王五</h1>
        <span>tom</span>
      </section>
      <p>第五题h2的最终颜色为黄色</p>
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